mima

when jason arranges his toy soldiers in rows of 6, he has left 1.when he arrahges them in rows of 8, he has 3 left over. when he arrenges in rowsof 10 then 5 left over. what is the smallest possible number of toy soldiers that jason plays with/

the sum of the digits of a two digit prime number is substracted from the number. prove that the difference cannot be a prime number.